Politely welcoming electronic doorbell

  
Inside:
Repository
The politely welcoming electronic doorbell circuit is composed of the trigger control circuit, audio amplifier output circuit, music circuit, voice delay control circuit, and it is shown in Figure 3-122. Trigger control circuit is composed of the doorbell button S, magnetic switches SA, transistors V4, V5, resistors R3, R4, R6, diodes VD2, VD3, and capacitor..
Politely welcoming electronic doorbell - schematic




Leave Comment

characters left:

New Circuits

.